// This set of controls performs orbiting, dollying (zooming), and panning.
// Unlike TrackballControls, it maintains the "up" direction object.up (+Y by default).
//
//    Orbit - left mouse / touch: one finger move
//    Zoom - middle mouse, or mousewheel / touch: two finger spread or squish
//    Pan - right mouse, or arrow keys / touch: three finger swipe

import {
  EventDispatcher, MOUSE, PerspectiveCamera, OrthographicCamera, Quaternion, Spherical, Vector2,
  Vector3
} from "three"

const OrbitControls = function ( object, domElement ) {

    this.object = object;

    this.domElement = ( domElement !== undefined ) ? domElement : document;

    // Set to false to disable this control
    this.enabled = true;

    // "target" sets the location of focus, where the object orbits around
    this.target = new Vector3();

    // How far you can dolly in and out ( PerspectiveCamera only )
    this.minDistance = 0;
    this.maxDistance = Infinity;

    // How far you can zoom in and out ( OrthographicCamera only )
    this.minZoom = 0;
    this.maxZoom = Infinity;

    // How far you can orbit vertically, upper and lower limits.
    // Range is 0 to Math.PI radians.
    this.minPolarAngle = 0; // radians
    this.maxPolarAngle = Math.PI; // radians

    // How far you can orbit horizontally, upper and lower limits.
    // If set, must be a sub-interval of the interval [ - Math.PI, Math.PI ].
    this.minAzimuthAngle = - Infinity; // radians
    this.maxAzimuthAngle = Infinity; // radians

    // Set to true to enable damping (inertia)
    // If damping is enabled, you must call controls.update() in your animation loop
    this.enableDamping = false;
    this.dampingFactor = 0.25;

    // This option actually enables dollying in and out; left as "zoom" for backwards compatibility.
    // Set to false to disable zooming
    this.enableZoom = true;
    this.zoomSpeed = 1.0;

    // Set to false to disable rotating
    this.enableRotate = true;
    this.rotateSpeed = 1.0;

    // Set to false to disable panning
    this.enablePan = true;
    this.keyPanSpeed = 7.0;	// pixels moved per arrow key push

    // Set to true to automatically rotate around the target
    // If auto-rotate is enabled, you must call controls.update() in your animation loop
    this.autoRotate = false;
    this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60

    // Set to false to disable use of the keys
    this.enableKeys = true;

    // The four arrow keys
    this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };

    // Mouse buttons
    this.mouseButtons = { ORBIT: MOUSE.LEFT, ZOOM: MOUSE.MIDDLE, PAN: MOUSE.RIGHT };

    // for reset
    this.target0 = this.target.clone();
    this.position0 = this.object.position.clone();
    this.zoom0 = this.object.zoom;

    //
    // public methods
    //

    this.getPolarAngle = function () {

      return spherical.phi;

    };

    this.getAzimuthalAngle = function () {

      return spherical.theta;

    };

    this.saveState = function () {

      scope.target0.copy( scope.target );
      scope.position0.copy( scope.object.position );
      scope.zoom0 = scope.object.zoom;

    };

    this.reset = function () {

      scope.target.copy( scope.target0 );
      scope.object.position.copy( scope.position0 );
      scope.object.zoom = scope.zoom0;

      scope.object.updateProjectionMatrix();
      scope.dispatchEvent( changeEvent );

      scope.update();

      state = STATE.NONE;

    };

    // this method is exposed, but perhaps it would be better if we can make it private...
    this.update = function () {

      var offset = new Vector3();

      // so camera.up is the orbit axis
      var quat = new Quaternion().setFromUnitVectors( object.up, new Vector3( 0, 1, 0 ) );
      var quatInverse = quat.clone().inverse();

      var lastPosition = new Vector3();
      var lastQuaternion = new Quaternion();

      return function update() {

        var position = scope.object.position;

        offset.copy( position ).sub( scope.target );

        // rotate offset to "y-axis-is-up" space
        offset.applyQuaternion( quat );

        // angle from z-axis around y-axis
        spherical.setFromVector3( offset );

        if ( scope.autoRotate && state === STATE.NONE ) {

          rotateLeft( getAutoRotationAngle() );

        }

        spherical.theta += sphericalDelta.theta;
        spherical.phi += sphericalDelta.phi;

        // restrict theta to be between desired limits
        spherical.theta = Math.max( scope.minAzimuthAngle, Math.min( scope.maxAzimuthAngle, spherical.theta ) );

        // restrict phi to be between desired limits
        spherical.phi = Math.max( scope.minPolarAngle, Math.min( scope.maxPolarAngle, spherical.phi ) );

        spherical.makeSafe();


        spherical.radius *= scale;

        // restrict radius to be between desired limits
        spherical.radius = Math.max( scope.minDistance, Math.min( scope.maxDistance, spherical.radius ) );

        // move target to panned location
        scope.target.add( panOffset );

        offset.setFromSpherical( spherical );

        // rotate offset back to "camera-up-vector-is-up" space
        offset.applyQuaternion( quatInverse );

        position.copy( scope.target ).add( offset );

        scope.object.lookAt( scope.target );

        if ( scope.enableDamping === true ) {

          sphericalDelta.theta *= ( 1 - scope.dampingFactor );
          sphericalDelta.phi *= ( 1 - scope.dampingFactor );

        } else {

          sphericalDelta.set( 0, 0, 0 );

        }

        scale = 1;
        panOffset.set( 0, 0, 0 );

        // update condition is:
        // min(camera displacement, camera rotation in radians)^2 > EPS
        // using small-angle approximation cos(x/2) = 1 - x^2 / 8

        if ( zoomChanged ||
          lastPosition.distanceToSquared( scope.object.position ) > EPS ||
          8 * ( 1 - lastQuaternion.dot( scope.object.quaternion ) ) > EPS ) {

          scope.dispatchEvent( changeEvent );

          lastPosition.copy( scope.object.position );
          lastQuaternion.copy( scope.object.quaternion );
          zoomChanged = false;

          return true;

        }

        return false;

      };

    }();

    this.dispose = function () {

      scope.domElement.removeEventListener( 'contextmenu', onContextMenu, false );
      scope.domElement.removeEventListener( 'mousedown', onMouseDown, false );
      scope.domElement.removeEventListener( 'wheel', onMouseWheel, false );

      scope.domElement.removeEventListener( 'touchstart', onTouchStart, false );
      scope.domElement.removeEventListener( 'touchend', onTouchEnd, false );
      scope.domElement.removeEventListener( 'touchmove', onTouchMove, false );

      document.removeEventListener( 'mousemove', onMouseMove, false );
      document.removeEventListener( 'mouseup', onMouseUp, false );

      window.removeEventListener( 'keydown', onKeyDown, false );

      //scope.dispatchEvent( { type: 'dispose' } ); // should this be added here?

    };

    //
    // internals
    //

    var scope = this;

    var changeEvent = { type: 'change' };
    var startEvent = { type: 'start' };
    var endEvent = { type: 'end' };

    var STATE = { NONE: - 1, ROTATE: 0, DOLLY: 1, PAN: 2, TOUCH_ROTATE: 3, TOUCH_DOLLY: 4, TOUCH_PAN: 5 };

    var state = STATE.NONE;

    var EPS = 0.000001;

    // current position in spherical coordinates
    var spherical = new Spherical();
    var sphericalDelta = new Spherical();

    var scale = 1;
    var panOffset = new Vector3();
    var zoomChanged = false;

    var rotateStart = new Vector2();
    var rotateEnd = new Vector2();
    var rotateDelta = new Vector2();

    var panStart = new Vector2();
    var panEnd = new Vector2();
    var panDelta = new Vector2();

    var dollyStart = new Vector2();
    var dollyEnd = new Vector2();
    var dollyDelta = new Vector2();

    function getAutoRotationAngle() {

      return 2 * Math.PI / 60 / 60 * scope.autoRotateSpeed;

    }

    function getZoomScale() {

      return Math.pow( 0.95, scope.zoomSpeed );

    }

    function rotateLeft( angle ) {

      sphericalDelta.theta -= angle;

    }

    function rotateUp( angle ) {

      sphericalDelta.phi -= angle;

    }

    var panLeft = function () {

      var v = new Vector3();

      return function panLeft( distance, objectMatrix ) {

        v.setFromMatrixColumn( objectMatrix, 0 ); // get X column of objectMatrix
        v.multiplyScalar( - distance );

        panOffset.add( v );

      };

    }();

    var panUp = function () {

      var v = new Vector3();

      return function panUp( distance, objectMatrix ) {

        v.setFromMatrixColumn( objectMatrix, 1 ); // get Y column of objectMatrix
        v.multiplyScalar( distance );

        panOffset.add( v );

      };

    }();

    // deltaX and deltaY are in pixels; right and down are positive
    var pan = function () {

      var offset = new Vector3();

      return function pan( deltaX, deltaY ) {

        var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

        if ( scope.object instanceof PerspectiveCamera ) {

          // perspective
          var position = scope.object.position;
          offset.copy( position ).sub( scope.target );
          var targetDistance = offset.length();

          // half of the fov is center to top of screen
          targetDistance *= Math.tan( ( scope.object.fov / 2 ) * Math.PI / 180.0 );

          // we actually don't use screenWidth, since perspective camera is fixed to screen height
          panLeft( 2 * deltaX * targetDistance / element.clientHeight, scope.object.matrix );
          panUp( 2 * deltaY * targetDistance / element.clientHeight, scope.object.matrix );

        } else if ( scope.object instanceof OrthographicCamera ) {

          // orthographic
          panLeft( deltaX * ( scope.object.right - scope.object.left ) / scope.object.zoom / element.clientWidth, scope.object.matrix );
          panUp( deltaY * ( scope.object.top - scope.object.bottom ) / scope.object.zoom / element.clientHeight, scope.object.matrix );

        } else {

          // camera neither orthographic nor perspective
          console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.' );
          scope.enablePan = false;

        }

      };

    }();

    function dollyIn( dollyScale ) {

      if ( scope.object instanceof PerspectiveCamera ) {

        scale /= dollyScale;

      } else if ( scope.object instanceof OrthographicCamera ) {

        scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, scope.object.zoom * dollyScale ) );
        scope.object.updateProjectionMatrix();
        zoomChanged = true;

      } else {

        console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.' );
        scope.enableZoom = false;

      }

    }

    function dollyOut( dollyScale ) {

      if ( scope.object instanceof PerspectiveCamera ) {

        scale *= dollyScale;

      } else if ( scope.object instanceof OrthographicCamera ) {

        scope.object.zoom = Math.max( scope.minZoom, Math.min( scope.maxZoom, scope.object.zoom / dollyScale ) );
        scope.object.updateProjectionMatrix();
        zoomChanged = true;

      } else {

        console.warn( 'WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.' );
        scope.enableZoom = false;

      }

    }

    //
    // event callbacks - update the object state
    //

    function handleMouseDownRotate( event ) {

      //console.log( 'handleMouseDownRotate' );

      rotateStart.set( event.clientX, event.clientY );

    }

    function handleMouseDownDolly( event ) {

      //console.log( 'handleMouseDownDolly' );

      dollyStart.set( event.clientX, event.clientY );

    }

    function handleMouseDownPan( event ) {

      //console.log( 'handleMouseDownPan' );

      panStart.set( event.clientX, event.clientY );

    }

    function handleMouseMoveRotate( event ) {

      //console.log( 'handleMouseMoveRotate' );

      rotateEnd.set( event.clientX, event.clientY );
      rotateDelta.subVectors( rotateEnd, rotateStart );

      var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

      // rotating across whole screen goes 360 degrees around
      rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientWidth * scope.rotateSpeed );

      // rotating up and down along whole screen attempts to go 360, but limited to 180
      rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight * scope.rotateSpeed );

      rotateStart.copy( rotateEnd );

      scope.update();

    }

    function handleMouseMoveDolly( event ) {

      //console.log( 'handleMouseMoveDolly' );

      dollyEnd.set( event.clientX, event.clientY );

      dollyDelta.subVectors( dollyEnd, dollyStart );

      if ( dollyDelta.y > 0 ) {

        dollyIn( getZoomScale() );

      } else if ( dollyDelta.y < 0 ) {

        dollyOut( getZoomScale() );

      }

      dollyStart.copy( dollyEnd );

      scope.update();

    }

    function handleMouseMovePan( event ) {

      //console.log( 'handleMouseMovePan' );

      panEnd.set( event.clientX, event.clientY );

      panDelta.subVectors( panEnd, panStart );

      pan( panDelta.x, panDelta.y );

      panStart.copy( panEnd );

      scope.update();

    }

    function handleMouseUp( event ) {

      // console.log( 'handleMouseUp' );

    }

    function handleMouseWheel( event ) {

      // console.log( 'handleMouseWheel' );

      if ( event.deltaY < 0 ) {

        dollyOut( getZoomScale() );

      } else if ( event.deltaY > 0 ) {

        dollyIn( getZoomScale() );

      }

      scope.update();

    }

    function handleKeyDown( event ) {

      //console.log( 'handleKeyDown' );

      switch ( event.keyCode ) {

        case scope.keys.UP:
          pan( 0, scope.keyPanSpeed );
          scope.update();
          break;

        case scope.keys.BOTTOM:
          pan( 0, - scope.keyPanSpeed );
          scope.update();
          break;

        case scope.keys.LEFT:
          pan( scope.keyPanSpeed, 0 );
          scope.update();
          break;

        case scope.keys.RIGHT:
          pan( - scope.keyPanSpeed, 0 );
          scope.update();
          break;

      }

    }

    function handleTouchStartRotate( event ) {

      //console.log( 'handleTouchStartRotate' );

      rotateStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

    }

    function handleTouchStartDolly( event ) {

      //console.log( 'handleTouchStartDolly' );

      var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
      var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;

      var distance = Math.sqrt( dx * dx + dy * dy );

      dollyStart.set( 0, distance );

    }

    function handleTouchStartPan( event ) {

      //console.log( 'handleTouchStartPan' );

      panStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

    }

    function handleTouchMoveRotate( event ) {

      //console.log( 'handleTouchMoveRotate' );

      rotateEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
      rotateDelta.subVectors( rotateEnd, rotateStart );

      var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

      // rotating across whole screen goes 360 degrees around
      rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientWidth * scope.rotateSpeed );

      // rotating up and down along whole screen attempts to go 360, but limited to 180
      rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight * scope.rotateSpeed );

      rotateStart.copy( rotateEnd );

      scope.update();

    }

    function handleTouchMoveDolly( event ) {

      //console.log( 'handleTouchMoveDolly' );

      var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
      var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;

      var distance = Math.sqrt( dx * dx + dy * dy );

      dollyEnd.set( 0, distance );

      dollyDelta.subVectors( dollyEnd, dollyStart );

      if ( dollyDelta.y > 0 ) {

        dollyOut( getZoomScale() );

      } else if ( dollyDelta.y < 0 ) {

        dollyIn( getZoomScale() );

      }

      dollyStart.copy( dollyEnd );

      scope.update();

    }

    function handleTouchMovePan( event ) {

      //console.log( 'handleTouchMovePan' );

      panEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );

      panDelta.subVectors( panEnd, panStart );

      pan( panDelta.x, panDelta.y );

      panStart.copy( panEnd );

      scope.update();

    }

    function handleTouchEnd( event ) {

      //console.log( 'handleTouchEnd' );

    }

    //
    // event handlers - FSM: listen for events and reset state
    //

    function onMouseDown( event ) {

      if ( scope.enabled === false ) return;

      event.preventDefault();

      switch ( event.button ) {

        case scope.mouseButtons.ORBIT:

          if ( scope.enableRotate === false ) return;

          handleMouseDownRotate( event );

          state = STATE.ROTATE;

          break;

        case scope.mouseButtons.ZOOM:

          if ( scope.enableZoom === false ) return;

          handleMouseDownDolly( event );

          state = STATE.DOLLY;

          break;

        case scope.mouseButtons.PAN:

          if ( scope.enablePan === false ) return;

          handleMouseDownPan( event );

          state = STATE.PAN;

          break;

      }

      if ( state !== STATE.NONE ) {

        document.addEventListener( 'mousemove', onMouseMove, false );
        document.addEventListener( 'mouseup', onMouseUp, false );

        scope.dispatchEvent( startEvent );

      }

    }

    function onMouseMove( event ) {

      if ( scope.enabled === false ) return;

      event.preventDefault();

      switch ( state ) {

        case STATE.ROTATE:

          if ( scope.enableRotate === false ) return;

          handleMouseMoveRotate( event );

          break;

        case STATE.DOLLY:

          if ( scope.enableZoom === false ) return;

          handleMouseMoveDolly( event );

          break;

        case STATE.PAN:

          if ( scope.enablePan === false ) return;

          handleMouseMovePan( event );

          break;

      }

    }

    function onMouseUp( event ) {

      if ( scope.enabled === false ) return;

      handleMouseUp( event );

      document.removeEventListener( 'mousemove', onMouseMove, false );
      document.removeEventListener( 'mouseup', onMouseUp, false );

      scope.dispatchEvent( endEvent );

      state = STATE.NONE;

    }

    function onMouseWheel( event ) {

      if ( scope.enabled === false || scope.enableZoom === false || ( state !== STATE.NONE && state !== STATE.ROTATE ) ) return;

      event.preventDefault();
      event.stopPropagation();

      handleMouseWheel( event );

      scope.dispatchEvent( startEvent ); // not sure why these are here...
      scope.dispatchEvent( endEvent );

    }

    function onKeyDown( event ) {

      if ( scope.enabled === false || scope.enableKeys === false || scope.enablePan === false ) return;

      handleKeyDown( event );

    }

    function onTouchStart( event ) {

      if ( scope.enabled === false ) return;

      switch ( event.touches.length ) {

        case 1:	// one-fingered touch: rotate

          if ( scope.enableRotate === false ) return;

          handleTouchStartRotate( event );

          state = STATE.TOUCH_ROTATE;

          break;

        case 2:	// two-fingered touch: dolly

          if ( scope.enableZoom === false ) return;

          handleTouchStartDolly( event );

          state = STATE.TOUCH_DOLLY;

          break;

        case 3: // three-fingered touch: pan

          if ( scope.enablePan === false ) return;

          handleTouchStartPan( event );

          state = STATE.TOUCH_PAN;

          break;

        default:

          state = STATE.NONE;

      }

      if ( state !== STATE.NONE ) {

        scope.dispatchEvent( startEvent );

      }

    }

    function onTouchMove( event ) {

      if ( scope.enabled === false ) return;

      event.preventDefault();
      event.stopPropagation();

      switch ( event.touches.length ) {

        case 1: // one-fingered touch: rotate

          if ( scope.enableRotate === false ) return;
          if ( state !== STATE.TOUCH_ROTATE ) return; // is this needed?...

          handleTouchMoveRotate( event );

          break;

        case 2: // two-fingered touch: dolly

          if ( scope.enableZoom === false ) return;
          if ( state !== STATE.TOUCH_DOLLY ) return; // is this needed?...

          handleTouchMoveDolly( event );

          break;

        case 3: // three-fingered touch: pan

          if ( scope.enablePan === false ) return;
          if ( state !== STATE.TOUCH_PAN ) return; // is this needed?...

          handleTouchMovePan( event );

          break;

        default:

          state = STATE.NONE;

      }

    }

    function onTouchEnd( event ) {

      if ( scope.enabled === false ) return;

      handleTouchEnd( event );

      scope.dispatchEvent( endEvent );

      state = STATE.NONE;

    }

    function onContextMenu( event ) {

      if ( scope.enabled === false ) return;

      event.preventDefault();

    }

    //

    scope.domElement.addEventListener( 'contextmenu', onContextMenu, false );

    scope.domElement.addEventListener( 'mousedown', onMouseDown, false );
    scope.domElement.addEventListener( 'wheel', onMouseWheel, false );

    scope.domElement.addEventListener( 'touchstart', onTouchStart, false );
    scope.domElement.addEventListener( 'touchend', onTouchEnd, false );
    scope.domElement.addEventListener( 'touchmove', onTouchMove, false );

    window.addEventListener( 'keydown', onKeyDown, false );

    // force an update at start

    this.update();

  };

  OrbitControls.prototype = Object.create( EventDispatcher.prototype );
  OrbitControls.prototype.constructor = OrbitControls;

  Object.defineProperties( OrbitControls.prototype, {

    center: {

      get: function () {

        console.warn( 'OrbitControls: .center has been renamed to .target' );
        return this.target;

      }

    },

    // backward compatibility

    noZoom: {

      get: function () {

        console.warn( 'OrbitControls: .noZoom has been deprecated. Use .enableZoom instead.' );
        return ! this.enableZoom;

      },

      set: function ( value ) {

        console.warn( 'OrbitControls: .noZoom has been deprecated. Use .enableZoom instead.' );
        this.enableZoom = ! value;

      }

    },

    noRotate: {

      get: function () {

        console.warn( 'OrbitControls: .noRotate has been deprecated. Use .enableRotate instead.' );
        return ! this.enableRotate;

      },

      set: function ( value ) {

        console.warn( 'OrbitControls: .noRotate has been deprecated. Use .enableRotate instead.' );
        this.enableRotate = ! value;

      }

    },

    noPan: {

      get: function () {

        console.warn( 'OrbitControls: .noPan has been deprecated. Use .enablePan instead.' );
        return ! this.enablePan;

      },

      set: function ( value ) {

        console.warn( 'OrbitControls: .noPan has been deprecated. Use .enablePan instead.' );
        this.enablePan = ! value;

      }

    },

    noKeys: {

      get: function () {

        console.warn( 'OrbitControls: .noKeys has been deprecated. Use .enableKeys instead.' );
        return ! this.enableKeys;

      },

      set: function ( value ) {

        console.warn( 'OrbitControls: .noKeys has been deprecated. Use .enableKeys instead.' );
        this.enableKeys = ! value;

      }

    },

    staticMoving: {

      get: function () {

        console.warn( 'OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead.' );
        return ! this.enableDamping;

      },

      set: function ( value ) {

        console.warn( 'OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead.' );
        this.enableDamping = ! value;

      }

    },

    dynamicDampingFactor: {

      get: function () {

        console.warn( 'OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead.' );
        return this.dampingFactor;

      },

      set: function ( value ) {

        console.warn( 'OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead.' );
        this.dampingFactor = value;

      }

    }

  } );

export default OrbitControls
